These '6 Overtures for Clavier' by Telemann demonstrate his prolific output and mastery of the Baroque idiom. They typically feature the grand, sectional form of the French overture, interspersed with spirited instrumental dances and contrapuntal passages.
Focus on maintaining a clear contrapuntal texture and executing the ornaments with precision and elegance.
6 Overtures for Clavier is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 9.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
6 Overtures for Clavier is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.